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. Steam-Boiler. No. 227,536. Patented May 11,1880;

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i 2 Sheets-Sheet 2 J.E. JERROLD.

, Steam-Boiler.

No. 227,536. Patented May 11,1880

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WITNESSES INVENTOR UNITED STATES PATENT Ounce,

JOHN E. JERROLD, OF KANSAS CITY, MISSOURI, ASSIGNOR TO HIMSELF, CHARLESHUBBARD, AND WM. F. SMITH, OF SAME PLAGE.

STEAM-BOILER.

SPECIFICATION forming part of Letters Patent No. 227,536, dated May 11,1880.

Application filed January 30, 1880.

To all whom it may concern:

Be it known that I, JOHN E. JERROLD, of Kansas City, in the county ofJackson and State of Missouri, have invented certain new and usefulImprovements in Steam-Boilers; and I do hereby declare the following tobe a full, clear, and exact description of the invention, such as willenable others skilled in the art to which it pertains to make and useit, reference being had to the accompanying drawings, which form part ofthis specification.

My invention relates to an improvement in steam-boilers, the objectbeing to prevent the deposition and accumulation of sediment and scaleson the crown-sheet of the boiler, and,

further, prevent the water in the boiler from priming and foaming whenimpure water is used; and to these ends my invention consists in thepeculiar construction and combination of parts in a steam-boiler, aswill hereinafter. be described, and pointed out in the claims.

In the accompanying drawings, Figure 1 is a transverse section throughthe fire-box of a steam-boiler provided with my improvement. Fig. 2 is alongitudinal section taken through the fire-box, and Fig. 3 is a planview of the shield over the crown-sheet properly secured in place.

A represents the outer shell, and B B the inner sheets, of the fire-boxof a locomotive or other steam-boiler.

O is the crown-sheet, the sides of which are bent downwardly and rivetedto the side sheets, B B.

Above the crown-sheet O is located a shieldplate, D, the sides of whichare riveted to the side sheets, 13 B, which latter, as will be observedin the drawings, extend above the crown sheet, the upper edges of theside sheets being flush with the upper surface of the shield-plate D.That portion of the side sheets projecting above the crown-sheet isshield-plate and transversely to its length, the outer ends of said barsresting upon the upper edges of the side sheets, B B.

Grown-sheet stay-bolts G are inserted upwardly through the crown-sheet,the heads at of the bolts resting against the under side of thecrown-sheet, while the bolts proper extend upwardly through thewater-space H between the crown-sheet and shield-plate, and through thelatter and up between the plates 0 0, constituting the crown-bars F.Upon the upper ends of the bolts are placed washers I, having lips orflanges it, which overlap the sides of the crown-bar plates 0 c andprevent their spreading, the upper ends of the bolts having nuts 2'applied thereto; or the ends may be upset and riveted to the washer.

K are thimbles surrounding the bolts G between the crown-sheet andshield-plate, the same serving to stay the crown-sheet, and also servingto protect the openings form ed therein for the introduction of thestay-bolts G. The sections 0 c of the crown-bars F are secured againstlateral spreading or displacement at their lower edges by means of therivets g, which latter also serve as pivotal bearings for the shortlinks L, to which stay-links are attached, the upper ends being securedto the outer shell of the boiler.

The shield-plate secured and arranged in the manner set forth serves toform a complete shield over the crown-sheet and prevent sediment orscales from accumulating on the crown-sheet, and also prevent theprimlng or foaming of the water. The contained water in the boiler flowsover the crown-sheet through the openings at opposite ends of theshield-plate, and a constant current is maintained over the crown-sheet,thus keeping the latter in a perfectly clean and safe condition.

Having fully described my invention, what I claim as new, and desire tosecure by Letters Patent, is-

1. In a steam-boiler, the combination, with the crown-sheet and sidesheets extending above the same to constitute the sides of acirculating-chamber over the crown-sheet, of a shield-plate located overthe crown-sheet and secured to the upwardlyprojecting ends of the sidesheets, and crown-bars placed on the shield-plate with their oppositeends resting upon the upper edges of the side sheets of the boiler,substantially as set forth.

2. The combination, with the crown-sheet 5 of a boiler and ashield-plate located above the crown-sheet and secured at its sides tothe side sheets of the firebox, which extend above the crown-sheet, ofcrown-bars placed on the top of the shield-plate, stay-bolts secured atIO opposite ends to the crown-bars and crown- 1 sheet, and thimblessurrounding the stay-bolts between the crown-sheet and shield-plate,substantially as set forth.

In testimony that I claim the foregoing I have hereunto set my hand this29th day of I 5 December, 1879.

JOHN EDWARD JERROLD.

Witnesses:

JAS. 0. CASTELLO, JAMEs SMITH.

